Highly Sensitive As3+ Detection Using Electrodeposited Nanostructured MnO x and Phase Evolution of the Active Material during Sensing

Tanvi Gupte, Sourav Kanti Jana, Jyoti Sarita Mohanty, Pillalamarri Srikrishnarka, Sritama Mukherjee, Tripti Ahuja, Chennu Sudhakar, Tiju Thomas*, Thalappil Pradeep

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

A simple, one-step electrodeposition approach has been used to fabricate MnOx on an indium-doped tin oxide substrate for highly sensitive As3+ detection. We report an experimental limit of detection of 1 ppb through anodic stripping voltammetry with selectivity to As3+ in the presence of 10 times higher concentrations of several metal ions. Additionally, we report the simultaneous phase evolution of active material occurring through multiple stripping cycles, wherein MnO/Mn2O3 eventually converts to Mn3O4 as a result of change in the oxidation states of manganese. This occurs with concomitant changes in morphology. Change in the electronic property (increased charge transfer resistance) of the material due to sensing results in an eventual decrease in sensitivity after multiple stripping cycles. In a nutshell, this paper reports stripping-voltammetry-induced change in morphology and phase of as-prepared Mn-based electrodes during As sensing.

Original languageEnglish
Pages (from-to)28154-28163
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number31
DOIs
Publication statusPublished - 7 Aug 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • arsenic
  • electrochemical sensor
  • manganese oxide
  • nanostructured electrode
  • stripping voltammetry

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